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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syntax
// ----------------------------------------------------------------------------
// Nodes
type Node interface {
aNode()
}
type node struct {
pos uint32
line uint32
doc *Comment // nil means no comment(s) attached
}
func (node) aNode() {}
func (n *node) init(p *parser) {
n.pos = uint32(p.pos)
n.line = uint32(p.line)
}
// ----------------------------------------------------------------------------
// Files
type File struct {
node
PkgName *Name
DeclList []Decl
Lines int
}
// ----------------------------------------------------------------------------
// Declarations
type (
Decl interface {
Node
aDecl()
}
ImportDecl struct {
decl
LocalPkgName *Name // including "."; nil means no rename present
Path *BasicLit
Group *Group // nil means not part of a group
}
ConstDecl struct {
decl
NameList []*Name
Type Expr // nil means no type
Values Expr // nil means no values
Group *Group // nil means not part of a group
}
TypeDecl struct {
decl
Name *Name
Type Expr
Group *Group // nil means not part of a group
}
VarDecl struct {
decl
NameList []*Name
Type Expr // nil means no type
Values Expr // nil means no values
Group *Group // nil means not part of a group
}
FuncDecl struct {
decl
Attr map[string]bool // go:attr map
Recv *Field // nil means regular function
Name *Name
Type *FuncType
Body []Stmt // nil means no body (forward declaration)
}
)
type decl struct{ node }
func (decl) aDecl() {}
// All declarations belonging to the same group point to the same Group node.
type Group struct {
dummy int // make sure it's not an empty node
}
// ----------------------------------------------------------------------------
// Expressions
type (
Expr interface {
Node
aExpr()
}
// Value
Name struct {
expr
Value string
}
// Value
BasicLit struct {
expr
Value string
}
// Type { ElemList[0], ElemList[1], ... }
CompositeLit struct {
expr
Type Expr // nil means no literal type
ElemList []Expr
NKeys int // number of elements with keys
}
// Key: Value
KeyValueExpr struct {
expr
Key, Value Expr
}
// func Type { Body }
FuncLit struct {
expr
Type *FuncType
Body []Stmt
}
// (X)
ParenExpr struct {
expr
X Expr
}
// X.Sel
SelectorExpr struct {
expr
X Expr
Sel *Name
}
// X[Index]
IndexExpr struct {
expr
X Expr
Index Expr
}
// X[Index[0] : Index[1] : Index[2]]
SliceExpr struct {
expr
X Expr
Index [3]Expr
}
// X.(Type)
AssertExpr struct {
expr
X Expr
// TODO(gri) consider using Name{"..."} instead of nil (permits attaching of comments)
Type Expr // nil means x.(type) (for use in type switch)
}
Operation struct {
expr
Op Operator
X, Y Expr // Y == nil means unary expression
}
// Fun(ArgList[0], ArgList[1], ...)
CallExpr struct {
expr
Fun Expr
ArgList []Expr
HasDots bool // last argument is followed by ...
}
// ElemList[0], ElemList[1], ...
ListExpr struct {
expr
ElemList []Expr
}
// [Len]Elem
ArrayType struct {
expr
// TODO(gri) consider using Name{"..."} instead of nil (permits attaching of comments)
Len Expr // nil means Len is ...
Elem Expr
}
// []Elem
SliceType struct {
expr
Elem Expr
}
// ...Elem
DotsType struct {
expr
Elem Expr
}
// struct { FieldList[0] TagList[0]; FieldList[1] TagList[1]; ... }
StructType struct {
expr
FieldList []*Field
TagList []*BasicLit // i >= len(TagList) || TagList[i] == nil means no tag for field i
}
// Name Type
// Type
Field struct {
node
Name *Name // nil means anonymous field/parameter (structs/parameters), or embedded interface (interfaces)
Type Expr // field names declared in a list share the same Type (identical pointers)
}
// interface { MethodList[0]; MethodList[1]; ... }
InterfaceType struct {
expr
MethodList []*Field
}
FuncType struct {
expr
ParamList []*Field
ResultList []*Field
}
// map[Key]Value
MapType struct {
expr
Key Expr
Value Expr
}
// chan Elem
// <-chan Elem
// chan<- Elem
ChanType struct {
expr
Dir ChanDir // 0 means no direction
Elem Expr
}
)
type expr struct{ node }
func (expr) aExpr() {}
type ChanDir uint
const (
_ ChanDir = iota
SendOnly
RecvOnly
)
// ----------------------------------------------------------------------------
// Statements
type (
Stmt interface {
Node
aStmt()
}
SimpleStmt interface {
Stmt
aSimpleStmt()
}
EmptyStmt struct {
simpleStmt
}
LabeledStmt struct {
stmt
Label *Name
Stmt Stmt
}
BlockStmt struct {
stmt
Body []Stmt
}
ExprStmt struct {
simpleStmt
X Expr
}
SendStmt struct {
simpleStmt
Chan, Value Expr // Chan <- Value
}
DeclStmt struct {
stmt
DeclList []Decl
}
AssignStmt struct {
simpleStmt
Op Operator // 0 means no operation
Lhs, Rhs Expr
}
BranchStmt struct {
stmt
Tok token // TODO(gri) token values are not yet exported
Label *Name
}
CallStmt struct {
stmt
Tok token // _Go, or _Defer -- TODO(gri) token values are not yet exported
Call *CallExpr
}
ReturnStmt struct {
stmt
Results Expr // nil means no (explicit) results
}
IfStmt struct {
stmt
Init SimpleStmt
Cond Expr
Then []Stmt
Else []Stmt
}
ForStmt struct {
stmt
Init SimpleStmt // incl. *RangeClause
Cond Expr
Post SimpleStmt
Body []Stmt
}
SwitchStmt struct {
stmt
Init SimpleStmt
Tag Expr
Body []*CaseClause
}
SelectStmt struct {
stmt
Body []*CommClause
}
)
type (
RangeClause struct {
simpleStmt
Lhs Expr // nil means no Lhs = or Lhs :=
Def bool // means :=
X Expr // range X
}
TypeSwitchGuard struct {
expr
// TODO(gri) consider using Name{"..."} instead of nil (permits attaching of comments)
Lhs *Name // nil means no Lhs :=
X Expr // X.(type)
}
CaseClause struct {
node
Cases Expr // nil means default clause
Body []Stmt
}
CommClause struct {
node
Comm SimpleStmt // send or receive stmt; nil means default clause
Body []Stmt
}
)
type stmt struct{ node }
func (stmt) aStmt() {}
type simpleStmt struct {
stmt
}
func (simpleStmt) aSimpleStmt() {}
// ----------------------------------------------------------------------------
// Comments
type CommentKind uint
const (
Above CommentKind = iota
Below
Left
Right
)
type Comment struct {
Kind CommentKind
Text string
Next *Comment
}
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